J
johnb1
Hello forum members, I am glad I found this very informative web-site. My name is John and I am a new member and this is my first post so I hope I have chosen the correct forum.
I have performed an MTBF on my electronics during the design phase of the project but I have come to the realization that it did not accurately predict the actual reliability of the hardware, i.e the measured failures exceeded predicted failures in time.
In the system, I have 22 components powered/running in parallel, with a published DPPM of 200 (40 DPPM for higher rated parts), and a published 9 FITs; any failure causes a catastrophic failure in the system. Each component has 4 die (88 per system) that could fail. I plan on having 5000 devices in the field (440000 die) and these devices will be powered/running 24/7 in the field. My dilema is figuring out what formulas can I use to calculate the correlation between DPPM and FIT data I have received and how can I determine my actual reliability with this system.
Also, to prevent single event catastrophic failures we are placing a redundant component to act as a back-up in the event of a die/component failure. Can someone point me in the right direction to calculating the probability of two failures occurring in the one system?
Thanks in advance, any help is much appreciated.
I have performed an MTBF on my electronics during the design phase of the project but I have come to the realization that it did not accurately predict the actual reliability of the hardware, i.e the measured failures exceeded predicted failures in time.
In the system, I have 22 components powered/running in parallel, with a published DPPM of 200 (40 DPPM for higher rated parts), and a published 9 FITs; any failure causes a catastrophic failure in the system. Each component has 4 die (88 per system) that could fail. I plan on having 5000 devices in the field (440000 die) and these devices will be powered/running 24/7 in the field. My dilema is figuring out what formulas can I use to calculate the correlation between DPPM and FIT data I have received and how can I determine my actual reliability with this system.
Also, to prevent single event catastrophic failures we are placing a redundant component to act as a back-up in the event of a die/component failure. Can someone point me in the right direction to calculating the probability of two failures occurring in the one system?
Thanks in advance, any help is much appreciated.